Setting upper constraints to wallaby branch of requirements

The upper constraints of the python dependencies were previously
set to the master as well as to the wallaby branch.

As there is a growing possibility of conflict between them,
it is preferrable to keep only one, branch accurate, version
of the constraints.

Furthermore the installation directive of the tox environment
is unnecessary, as the the dependencies can be specified
separately and pulled during environment setup.

Closes-Bug: #1941897

Signed-off-by: Jiri Podivin <jpodivin@redhat.com>
Change-Id: I6a4b23824a1969668bbd02acab9db38c0f1291e9

tox.ini

@@ -11,7 +11,6 @@ ignore_basepython_conflict = True
 [testenv]
 basepython = python3
 usedevelop = True
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/wallaby} {opts} {packages}
 passenv =
   LANG
   LANGUAGE
@@ -23,7 +22,7 @@ setenv =
   LC_ALL={env:LC_ALL:en_US.UTF-8}
   VIRTUAL_ENV={envdir}
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/wallaby}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
@@ -65,6 +64,7 @@ commands = oslo_debug_helper -t tripleoclient/tests {posargs}
 [testenv:docs]
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/wallaby}
+  -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -a -E -W --keep-going -b html doc/source doc/build/html